as you probably read: Joomleague is not compatible with J3+ at this moment.Mainly due to a different template (isis), deprecated code, bootstrap.But another thing is the strict query's and the minimal error reporting

- do you know the line + file the error is poiting to?it seems to be the file admin\assets\updates\jl_install.php- did you succeed with the install?- was it with an update?

It seems that the function is checking the table "joomleague_version" and if it can't find the field majorit's running a query to add some columns/fields. So to circumvent that issue you can add the fields manually.

This is the code in that file. As you can see it's adding the columns: major, minor, build,count,revision,file